Why will a pulmonary embolism cause low o2 but not high co2?

V/Q mismatch. A large pe will cause elevated c02 and require more respiratory effort because the physiologic "dead space" will increase and the body may not be able to compensate with increased breathing. For the same reason the affected area of lung cannot participate in gas exchange which may lead to inadequate oxygenation - or low o2.
Ventilation. A pulmonary embolism causes the respiratory rate to increase and it is easier to eliminate co2 than it is to oxygenate. Also in some severe cases the co2 can indeed be increased which is a poor prognostic sign.

Related Questions

How to know if I get enough oxygen what if I'm about to get a pulmonary embolism and die?

Shortness of breath. A pulmonary embolism can be fatal, but is more often treated successfully. Chest pain that gets worse with deep breathing, shortness of breath and feeling anxious with a rapid pulse are common. Look for blue color of the lips or finger nails for low oxygen. Swollen legs, long travel or lying in bed and some medical conditions can cause this. Call your doctor right away for any of these symptoms. . Read more...
Pulmonary embolism. There are tests that can test the amount of oxygen in the blood. Unfortunately you can't tell if your about to get a pulmonary embolism (PE) and die, there are conditions that may predispose you to PE. If you have a family history there may be some genetic factors or have been immobile for a very long time this may predispose someone to a PE . Read more...
A pulse oximeter. can measure O2 in your body. PE cannot be predicted. If you have a predisposing condition or a family history of blood clots consult your doctor, If this fear is interfering wth your daily life seek counseling. Read more...

Pulmonary embolism after beg d dimer normal ECG BP and oxygen????

PE. With a negative d-dimer there is not further work up because it indicates no clot. So I would not worry . You can have sharp chest pain on breathing with costochondritis an inflammation of the rib junctions.Press around the chest and you may find a sore sport. Motrin/Aleve can help with the pain. Also consider reflux. Discuss with doctor. Read more...
Not likely. All of the factors you list speak against a PE. You did not mention anything here that would suggest a PE, why do hou or your doctor think it might have happened. D Dimer in particular is pretty sensitive . Read more...

Normal ECG normal oxygen normal chest X-ray normal BP pulmonary embolism??

Likely. The way to prove it for sure is a PE scan. If you are having chest pain be reviewed. All the best. Read more...
Must see a physician. I believe you have inquired about this topic multiple times in the past week or so. If you remain concerned that the ER doctors missed something the question is wether your concern is warranted or is your concern due to emotional difficulties and unnecessary fear. Asking further questions here won't help you. You should either see consult with your physician or arrange for a consultation on HT. Read more...
Not usually. all the things you report are reassuring but there is no clinical context, such as chest pain, shortness of breath, blood gas. The best test for PE is a CT scan of the chest with contrast , however this may miss small emboli and may be negative after 24-48 hours . IT is hard to be certain from the little data provided . Why did you or your doctor think you might have a PE? Read more...

Two normal d dimers last week normal BP normal oxygen normal chest X-ray normal tropin normal ECG still worried about pulmonary embolism?

Unlikely . With two negative d dimers, the changes of having a PE is very unlikely. The rationale for this test is to prove no PE. it is a very sensitive test when negative. Read more...
Disease fixation. You evidence a real problem with your fixation on sudden death related conditions. Your data given here suggests you have no real sudden death risk but that you need to see a professional for help with your psychological problems. Long distance answers from here are highly unlikely to give you relief. Read more...

Can a blood clot give you chest and jaw pain? I breathe normally, but feel like no oxygen is going to my brain...Whiteouts also. Pulmonary embolism?

This is more likely . Angina, cardiac origin (coronary artery disease) and less likely the presentation of pe. If symptoms just came, chew an Aspirin and get seen at the er. If going on for a while, need to see your doctor sooner than later for a detailed cardiovascular exam, imaging and stress testing. Read more...
Call doctor. You need to be seen by someone asap. This can be bery serious. See doctor or go to er. Read more...